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clk: fix clk_get on of_clk_get_by_name return check 

The commit 766e6a4 (clk: add DT clock binding support) plugs device
tree clk lookup of_clk_get_by_name into clk_get, and fall on non-DT
lookup clk_get_sys if DT lookup fails.

The return check on of_clk_get_by_name takes (clk != NULL) as a
successful DT lookup.  But it's not the case.  For any system that
does not define clk lookup in device tree, ERR_PTR(-ENOENT) will be
returned, and consequently, all the client drivers calling clk_get
in their probe functions will fail to probe with error code -ENOENT
returned.

Fix the issue by checking of_clk_get_by_name return with !IS_ERR(clk),
and update of_clk_get and of_clk_get_by_name for !CONFIG_OF build
correspondingly.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Tested-by: Marek Vasut <marex@denx.de>
Tested-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Shawn Guo 2012-07-18 11:52:22 +08:00 committed by Mike Turquette
parent c782c384d2
commit 9f1612d351
2 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/clk/clkdev.c
View File

@ -157,7 +157,7 @@ struct clk *clk_get(struct device *dev, const char *con_id)
if (dev) {
clk = of_clk_get_by_name(dev->of_node, con_id);
if (clk && __clk_get(clk))
if (!IS_ERR(clk) && __clk_get(clk))
return clk;
}

5
include/linux/clk.h
View File

@ -12,6 +12,7 @@
#ifndef __LINUX_CLK_H
#define __LINUX_CLK_H
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/notifier.h>
@ -320,12 +321,12 @@ struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
#else
static inline struct clk *of_clk_get(struct device_node *np, int index)
{
return NULL;
return ERR_PTR(-ENOENT);
}
static inline struct clk *of_clk_get_by_name(struct device_node *np,
const char *name)
{
return NULL;
return ERR_PTR(-ENOENT);
}
#endif